Amazon.com: New Hand Made ABY Switch Box For Effects Pedal-True Bypass/ Guitar AB : Musical Instruments
nikplayer.com: My DIY Foot Switch
KIT guitar pedal A/B switch box (2 IN, 1 OUT) - DIY PEDAL GEAR PARTS
DIY AB not Y | TalkBass.com
Build Your Own Guitar Amp Foot Switch (Under $15) - YouTube
Pin on electronics DIY
A special mini amp channel switcher/FX loop pedal (When you actually only use 1 of the 2 functions and the other is always on or off) Details in comments. : r/diypedals